永磁同步变频离心式冷水机组的研制及性能分析

摘要

Improvement of Coefficient of Performance (COP) and Integrated Part Load Value (IPLV) of the centrifugal chiller is highly important for the energy saving of public buildings in China.The Permanent-magnetic Synchronous Frequency-convertible (PSF) centrifugal chiller applies many key technologies,such as the double-stage compression with flash-gas inter-stage suction cycle,the pneumatic design of the compressor under wide-range operation conditions,the directly-driven compressor by high-speed motor,the high-speed large-power PSF motor with corresponding frequency converter etc.The performance indexes of the PSF cen-trifugal chiller,including the cyclic efficiency,isentropic efficiency,mechanic efficiency,motor efficiency and frequency converting efficiency,have been greatly improved.Experimental results of the 1000 RT PSF centrifugal chiller show that the rating COP rea-ches 7.03,the IPLV reaches 11.68,and the maximum part load COP reaches 20.30.The performance of the PSF centrifugal chil-ler is much better than that of a common frequency-convertible centrifugal chiller.%提升离心式冷水机组的满负荷能效系数（COP）与综合部分负荷能效系数（IPLV），对于我国公共建筑节能具有非常重要的意义。永磁同步变频离心式冷水机组采用了双级压缩中间补气循环、压缩机全工况气动设计、高速电机直接驱动结构、高速大功率永磁同步变频调速电机及相应变频器等关键技术，其循环效率、绝热效率、机械效率、电机效率、变频器效率等均得到大幅提升。实测结果显示，永磁同步变频离心式冷水机组的额定工况 COP 达到7．03，IPLV 达到11．68，部分负荷最高 COP 达到20．30，其性能相对于常规变频离心式冷水机组大幅提高。